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**__ Black holes __** Black holes are an incredible theory to explain and understand the spots in the sky that you can’t see. Since they seem so unreal from anything we could ever imagine people create many theories about them. It’s very difficult to imagine these monstrous things.They defy so many laws of physics, and that’s part of excitement of them. In science fiction writers use black holes in travel though space and time. Even though they seem so unrealistic there is a lot of evidence that supports their existence.

__ What are black holes? __

Black holes are objects in space where gravitational pull is so strong it makes a hole in space and time. Scientists think of space as a piece of cloth, everything weights it down somewhat based on its weight but black holes weight so much they make a hole. Black holes are invisible. They don’t reflect light, because of their escape velocity. Everything had an escape velocity, the speed you must travel to escape from its orbit. To escape from a black hole an object would need to travel at 186,000 miles per second, which is faster than the speed of light, so light cannot escape. Since nothing can go faster than the speed of light, nothing can escape from a black hole.

People believe that there are many types of black holes. Some types of black holes are about their size like stellar, super massive, and mini black holes. Other types of black holes depend on whether they spin. Schwarzschild black holes are theory of a type of black hole that doesn’t spin. Stellar black holes are huge black holes that come from a big star that turns into a supernova. Then becomes a neutron and accretion turns it into a black hole. Super massive black holes are even more massive than stellar black holes. There two possibilities of their formation. One possibility is they form when stellar black holes take in lots of matter. Another possibility of there formation is the outcome of two stellar black holes colliding. Scientists believe there may be one supper massive black hole in the center of each galaxy. Mini black holes are a theory of small black holes that could be as small as the sun. They are very dense, and would die out quickly because they would have nothing to consume.

__ Evidence of black holes __

People have been thinking about black holes science the 1700’s, but have only recently found evidence of them. In 1783, John Michell hypothesized that there might be an object where the escape velocity is faster the speed of light. Then in 1796 Simon Pierre LaPlace predicted the existence of black holes. In 1915 Einstein wrote __ Theory of General Relativity __, which predicted that space is curved. This helped prove the existence of black holes. After that in 1970 Stephen Hawking described the modern theory of black holes. Finally in 1994 the Hubble Space Telescope found the best evidence of super massive black holes. In 2018 scientists will send of the Lisa Space Mission, which will orbit the sun that will try to pick up gravitational waves. Gravitational waves are waves of energy that black holes give off. They are invisible and hard to find. Hopefully this will give scientists lots of evidence of black holes.

Finding black holes is difficult because you can’t see them. One way to look for them is to use the binary star system. The binary star system is a pair of stars orbiting the same mass. One of these stars could be a black hole, and suck the life out of the other star.

In a black hole nothing can escape from the event horizon. Joseph F. Dolan of NASA saw pulses of ultra violet from bits of hot gas fade then disappear when they orbit Cygnus, a massive object that scientist believe is a black holes.

__ What if you fall in? __

There are different parts of a black hole. The two main parts are the event horizon and singularity. The event horizon is where the black hole stars; it’s the point of no return. Once things pass the event horizon they get sucked into the singularity, a single point where everything that gets sucked into the black hole ends up in, if they ever end up there. May theories suggest that nothing will ever end up there. As something approaches a singularity it will keep spinning and spinning, but never reach the singularity. To the people watching it will look like you fell in an instant.

There are many theories about what’s inside of a black hole but probably no one will ever know because they die first. When things fall in a black hole they stretched out and ripped apart, and they would probably burn to death before they ever ended up there.

__ Myths and possibilities __

No one is certain that black holes exist. There are many ideas and theories that may be unrealistic and don’t have a lot of evidence to support them. One idea is that whatever falls into a black hole goes through wormholes. Wormholes connect black holes to white holes were the matter is discharged. Wormholes may lead to another universe o to another place in our universe. Wormholes allow you to travel through spac e and time. Time travel may work because different options to decisions that can happen in different dimensions. Many scientist believe that white holes can only exist in a universe were time moves backwards, so wormholes and white hole may not exist in our universe but may exist in other universes or black holes in our universe may lead to a white hole in another universe where time moves backwards.

Many people and scientists and people believe black holes lead to another universe but what if our universe is inside a black hole. Our universe may be in the singularity of a black hole. If our universe is inside of a black hole it must spin, and it does. Stephan Hawking, a famous scientist believes that in 10,000,000,000,000,000,000,000 years all matter from a black will be in normal space again. If this is true our universe will be put into normal space again, but it won’t for a long time.

Black holes are some of the most amazing things we know about. Scientists know so much about them, yet their existence is almost unreal. There is so much we can learn about them, if they really do exist. The possibilities scientist have come up with may be far from the truth, but maybe there really are wormholes or maybe we live inside a giant black hole.

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// "Black Holes - History." //Amazing Space//. Web. 11 Jan. 2011. < [|__http://amazing-space.stsci.edu/resources/explorations/blackholes/lesson/whatisit/__] history.html // // "File:Trou-de-ver.gif." //Wikimedia Commons//. Web. 01 Feb. 2011. . // LISA - Laser Interferometer Space Antenna//. Web. 01 Feb. 2011. 